US5863996A - Solution polymerization to form sol of crosslinked particles - Google Patents
Solution polymerization to form sol of crosslinked particles Download PDFInfo
- Publication number
- US5863996A US5863996A US08/487,394 US48739495A US5863996A US 5863996 A US5863996 A US 5863996A US 48739495 A US48739495 A US 48739495A US 5863996 A US5863996 A US 5863996A
- Authority
- US
- United States
- Prior art keywords
- polymeric material
- cross
- monomers
- cal
- solubility parameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 239000002245 particle Substances 0.000 title claims abstract description 19
- 238000010528 free radical solution polymerization reaction Methods 0.000 title claims abstract 3
- 239000000463 material Substances 0.000 claims abstract description 34
- 239000000178 monomer Substances 0.000 claims abstract description 29
- 239000002904 solvent Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000001257 hydrogen Substances 0.000 claims abstract description 12
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 12
- 125000005647 linker group Chemical group 0.000 claims abstract description 9
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 7
- 238000001879 gelation Methods 0.000 claims abstract description 6
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 230000000379 polymerizing effect Effects 0.000 claims abstract 5
- 238000006116 polymerization reaction Methods 0.000 claims abstract 4
- -1 C1-8 alkyl methacrylate Chemical compound 0.000 claims description 58
- 229920000642 polymer Polymers 0.000 claims description 49
- 239000000203 mixture Substances 0.000 claims description 36
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- 239000011521 glass Substances 0.000 claims description 5
- BJELTSYBAHKXRW-UHFFFAOYSA-N 2,4,6-triallyloxy-1,3,5-triazine Chemical compound C=CCOC1=NC(OCC=C)=NC(OCC=C)=N1 BJELTSYBAHKXRW-UHFFFAOYSA-N 0.000 claims description 4
- 230000001427 coherent effect Effects 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
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- 238000002360 preparation method Methods 0.000 abstract description 10
- 239000007810 chemical reaction solvent Substances 0.000 abstract description 4
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- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 4
- 229910015900 BF3 Inorganic materials 0.000 description 4
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 description 4
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 4
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 4
- 150000001299 aldehydes Chemical class 0.000 description 4
- 150000001408 amides Chemical group 0.000 description 4
- 125000003118 aryl group Chemical group 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
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- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
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- GRWFGVWFFZKLTI-UHFFFAOYSA-N rac-alpha-Pinene Natural products CC1=CCC2C(C)(C)C1C2 GRWFGVWFFZKLTI-UHFFFAOYSA-N 0.000 description 1
- 238000007342 radical addition reaction Methods 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000003678 scratch resistant effect Effects 0.000 description 1
- CDAISMWEOUEBRE-UHFFFAOYSA-N scyllo-inosotol Natural products OC1C(O)C(O)C(O)C(O)C1O CDAISMWEOUEBRE-UHFFFAOYSA-N 0.000 description 1
- ZLGIYFNHBLSMPS-ATJNOEHPSA-N shellac Chemical compound OCCCCCC(O)C(O)CCCCCCCC(O)=O.C1C23[C@H](C(O)=O)CCC2[C@](C)(CO)[C@@H]1C(C(O)=O)=C[C@@H]3O ZLGIYFNHBLSMPS-ATJNOEHPSA-N 0.000 description 1
- 239000004208 shellac Substances 0.000 description 1
- 229940113147 shellac Drugs 0.000 description 1
- 235000013874 shellac Nutrition 0.000 description 1
- 229920005573 silicon-containing polymer Polymers 0.000 description 1
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 description 1
- 238000000935 solvent evaporation Methods 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 101150035983 str1 gene Proteins 0.000 description 1
- 150000003444 succinic acids Chemical class 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 150000003504 terephthalic acids Chemical class 0.000 description 1
- NBRKLOOSMBRFMH-UHFFFAOYSA-N tert-butyl chloride Chemical compound CC(C)(C)Cl NBRKLOOSMBRFMH-UHFFFAOYSA-N 0.000 description 1
- 229950011008 tetrachloroethylene Drugs 0.000 description 1
- IEXRMSFAVATTJX-UHFFFAOYSA-N tetrachlorogermane Chemical compound Cl[Ge](Cl)(Cl)Cl IEXRMSFAVATTJX-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- LTSUHJWLSNQKIP-UHFFFAOYSA-J tin(iv) bromide Chemical compound Br[Sn](Br)(Br)Br LTSUHJWLSNQKIP-UHFFFAOYSA-J 0.000 description 1
- RUELTTOHQODFPA-UHFFFAOYSA-N toluene 2,6-diisocyanate Chemical compound CC1=C(N=C=O)C=CC=C1N=C=O RUELTTOHQODFPA-UHFFFAOYSA-N 0.000 description 1
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 1
- 239000003860 topical agent Substances 0.000 description 1
- 230000000699 topical effect Effects 0.000 description 1
- KFUSEUYYWQURPO-OWOJBTEDSA-N trans-1,2-dichloroethene Chemical group Cl\C=C\Cl KFUSEUYYWQURPO-OWOJBTEDSA-N 0.000 description 1
- 230000004102 tricarboxylic acid cycle Effects 0.000 description 1
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/04—Polymerisation in solution
- C08F2/06—Organic solvent
Definitions
- This invention relates to polymeric materials; more particularly this invention relates to polymeric materials comprising cross-linked particles which are capable of forming sols; to processes for their preparation; and to compositions comprising them.
- a solution polymerisation process for the preparation of a polymeric material having a weight average molecular weight from 5,000 to 20,000,000 and comprising cross-linked particles which are capable of forming a sol in the reaction solvent which process comprises:
- the solution polymerisation process of the invention may be an addition, for example a cationic, anionic or free radical, polymerisation or a condensation polymerisation.
- a class of addition polymerisation to which the present invention may advantageously be applied is cationic addition polymerisation to which the following types of monomer, inter alia, are susceptible:
- the, or one of the, monomers comprises a polymerisable cyclic (thio)ether.
- (thio)ether is meant herein an ether or a thioether.
- Suitable polymerisable cyclic (thio)ethers have the formula: ##STR1## in which: R 1 , R 2 and R 4 , which may be the same or different, each represent a hydrogen atom or a substituted or unsubstituted hydrocarbyl or hydrocarbyloxy group;
- R 3 represents a substituted or unsubstituted methylene, ethylene or 1,3-propylene group
- R 5 represents a monovalent polymerisable group
- Q represents an oxygen or a sulpur atom
- X represents: ##STR2## in which: Y represents an oxygen atom or a --NR 6 -group wherein R 6 represents any of the values which R 1 may assume;
- a is 0 or 1
- b is 0 or 1;
- c 1 or 2;
- d is 0 or 1
- the groups R 1 , R 2 and R 4 may each represent a substituted or unsubstituted hydrocarbyl or hydrocarbyloxy group: examples include unsubstituted or halo-substituted C 1 to C 4 alkyl, such as methyl or ethyl; unsubstituted or halo-substituted C 6 to C 10 aryl or aralkyl, such as phenyl or benzyl; and oxy analogues.
- R 4 increase in the size of the group increases the steric hindrance to the hydrolysable ester or amide function X and thereby increases the stability of the polymer.
- R 1 R 2 and R 4 represents a hydrogen atom.
- the group R 3 may represent a mono- or poly- substituted ethylene group, preferably an unsubstituted ethylene group; that is, a dihydro(thia)pyran derivative.
- Preferred such compounds are ethers; that is, those compounds of the above formula wherein Q represents an oxygen atom, especially dihydropyrans.
- X may, as shown, represent any hydrolysable carboxylic acid ester, carbonate ester or oxalate ester function, or an amide analogue. Preferably, however, X represents --COO--or --CH 2 OCO--.
- R 5 may suitably represent any group which can participate in cationic polymerisation; for example those derivable from monomers (a) to (e) mentioned hereinbefore.
- Preferred examples are vinyl (thio)ether and epoxy groups.
- R 5 represents a cyclic vinyl (thio)ether, especially of the formula: ##STR4## in which:
- R 1 ', R 2 ', R 3 ' and R 4 ' which may be the same or different, represent any of the values which R 1 , R 2 , R 3 and R 4 may assume;
- M represents the group --ZX'--
- Q' represents an oxygen or sulphur atom
- X' represents any of the values which X may assume
- Z represents a single bond or a substituted or unsubstituted hydrocarbylene.
- Especially preferred polymerisable cyclic ethers are the reaction products formed by subjecting one or a mixture of dihydropyran aldehydes to disproportionation by the Tischenko reaction; they have the formula: ##STR5## in which: R 1 ', R 2 ' and R 4 ', which may be the same or different, represent any of the values which R 1 , R 2 and R 4 respectively may assume.
- a preferred such compound is acrolein tetramer (in which the R i all represent hydrogen atoms).
- Polymerisable cyclic ethers wherein X comprises a --COO--or --CH 2 OCO--group may conveniently be prepared from the tetramer of the corresponding unsaturated aldehyde produced by the Tischenko reaction; namely: ##STR6##
- cyclic ethers wherein X comprises a --COO--group may be prepared by reaction of the tetramer with an alcohol R 5 OH using a transesterification catalyst and reaction conditions: ##STR7##
- Cyclic ethers wherein X comprises a --CH 2 OCO--group may be prepared by reaction of the tetramer with a lower alkyl carboxylic acid ester R 5 COOR 7 in which R 7 represents a lower alkyl group using a transesterification catalyst and reaction conditions: ##STR8##
- the corresponding amides may be prepared analogously.
- Cyclic ethers where X comprises a --COO--group may also be obtained by mild oxidation of the dimer of the corresponding unsaturated aldehyde, followed by esterification of the salt, for example the silver salt.
- Meta-carbonates and oxalates may be obtained, respectively, by esterification and transesterification: ##STR10##
- acrolein tetramer is readily prepared from acrolein which is a commercially available material; can readily be purified; and has been found to be satisfactory in the practice of this invention.
- polymerisable cyclic ethers include bis-(3,4-dihydropyran-2-ylmethyl) succinate, bis-(3, 4-dihydropyran -2-ylmethyl) o-terephthalate, bis-(3,4-dihydropyran-2-yl) adipate, bis-(3,4-dihydropyran-2-ylmethyl) adipate, ##STR11## wherein:
- n represents a number of at least one; and R 8 is a polyvalent organic bridging group which desirably does not contain a basic group since these can interfere with the acid catalysis required, as will be explained later, for the polymerisation.
- a further class of addition polymerisation to which the present invention may also advantageously be applied is free radical addition polymerisation.
- the, or one of the, monomers comprises a vinyl- or vinylidene group-containing monomer, preferably a substituted or unsubstituted (meth)acrylate ester, especially a C 1 to C 8 alkyl methacrylate.
- Such monomers include methylacrylate, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, n-hexyl methacrylate, ethyl hexyl methacrylate, lauryl methacrylate, phenyl acrylate, isodecyl methacrylate, 2-ethoxyethyl methacrylate, 2-n-butoxy ethyl methacrylate, 2-(2-ethoxyethoxy)ethyl methacrylate, 2-phenoxyethyl acrylate and 2-phenoxyethyl methacrylate.
- Such monomers require the presence of a bis- or tris-vinyl or vinylidene group-containing monomer as cross-linking agent.
- This may be a hydrocarbon, for example an unsubstituted or hydrocarbyloxylated aromatic hydrocarbon such as divinyl benzene.
- the cross-linking agent comprises a bis- or tris- vinyl or vinylidene group-containing ester, particularly preferred examples being the bis-methacrylate ester of polyethylene glycol, the bis-methacrylate ester of ethylene glycol or triallyl cyanurate.
- Cationically polymerisable monomers in classes (b) and (e) above may also be free radical polymerised.
- epoxides and episulphides are particularly versatile, being also susceptible to anionic addition polymerisation, for example with organometallic initiators.
- Suitable monoepoxides include the alkylens oxides such as ethylene oxide, propylene oxide and butylene oxides; the aromatic oxides such as styrene oxide.
- Polyepoxides include many commercially available (cyclo)aliphatic and aromatic polyepoxides, such as: ##STR12##
- Analogous mono- and polyepisulphides may also be used, especially ethylene and propylene sulphides.
- condensation polymerisation there are many classes of condensation polymerisation to which the present invention is applicable; for example, condensation polymerisations for the production of polyamides, polyesters, polycarbonates, phenol-formaldehydes, urea-formaldehydes, urea-melamines and polyurethanes, particularly the latter.
- one of the monomers comprises a polyisocyanate, for example a diisocyanate such as a (cyclo)aliphatic, araliphatic or aromatic diisocyanate.
- 2,4, and 2,6 toluene diisocyanate include 2,4, and 2,6 toluene diisocyanate; (cyclo)aliphatic diisocyanates such as 1,6-hexamethylene diisocyanate, isophorone diisocyanate, 4,4'-dicyclohexyl methane diisocyanate, and cyclohexylene 1,2- and 1,4- diisocyanate; and araliphatic diisocyanates such as 4,4'-diphenylmethane diisocyanate.
- a versatile group of cross-linking agents particularly for polyurethanes and also for cationically polymerisable species, such as the cyclic (thio)ethers, are monomers comprising at least three groups containing a reactive hydrogen atom such as a hydroxy, carboxy, amino or mercapto group (amino not being preferred for cationic polymerisation), for example those comprising at least three groups which are hydroxyl, and/or carboxyl groups.
- Examples include polycarboxylic acids, polyhydric phenols, hydroxy acids and polyhydric alcohols, desirably those with less than 18, preferably less than 10, carbon atoms; for example aliphatic polyols such as glycerol, erythritol, pentaerythritol, sorbitol, dulcitol, inositol, 2-ethyl-2-hydroxy-methylpropane-1,3-diol and 1,2,6-hexanetriol; aromatic polyols such as 1,2,3-trihydroxybenzene, 1,2,4-trihydroxybenzene, 1,3,5-trihydroxybenzene; araliphatic polyols; hydroxy aliphatic, alicyclic and aromatic carboxylic acids, including Krebs cycle acids, such as citric acid, malic acid, tartaric acid, 2-hydroxy-3-methyl (D) succinic acid, ascorbic acid, 2,3,-dihydroxybenzoic acid, 2,4,-dihydroxy-benzo
- polycarboxylic acids Preferably the polycarboxylic acids, polyhydric phenols, hydroxy acids and polyhydric alcohols are linear.
- Monomers comprising two groups containing reactive hydrogen atoms as aforesaid, for example di-carboxy or hydroxy substituted monomers may be utilised, especially as comonomers with cyclic(thio) ethers, epoxides or polyisocyanates, for example to produce polymers of the type disclosed in U.K. 1,572,598 and U.S. Pat. No. 4,221,779.
- di-carboxy or hydroxy monomers examples include dicarboxylic acids, dihydric phenols, hydroxyacids, glycols and polyesters thereof, desirably those with less than 18, preferably less than 10, carbon atoms; for example oxalic, malonic, succinic, glutaric, and adipic acids, 1,2-cyclohexanedicarboxylic, 1,3-cyclohexanedicarboxylic and 1,4-cyclohexanedicarboxylic acids, phthalic, isophthalic and terephthalic acids, 4,4'-dihydroxyphenyl-2,2-propane, resorcinol, quinol and orsinol, lactic, 2-hydroxyisobutyric, 10-hydroxydecanoic, 12-hydroxyoctadecenoic, 12-hydroxy-cis-9-octadecenoic, 2-hydroxycyclohexane carboxylic, 2-hydroxy-2-phenyl (D) propionic, dipheny
- Glycols are most suitable, especially the C 2 to C 6 , preferably C 2 to C 4 glycols.
- Mixtures of dicarboxylic acids, dihydric phenols, hydroxy acids and glycols may be used.
- the dicarboxylic acids, dihydric phenols, hydroxy acids and glycols are linear.
- Suitable Bronsted and Lewis acids include strong mineral acids which are not redox reagents under the reaction conditions such as hydrochloric and sulphuric acid, tosylic acid, brosylic acid and the adduct of methanol and boron trifluoride.
- Suitable Lewis acids include boron trifluoride and its etherate, boron tribromide, aluminium trichloride, aluminium tribromide, gallium trichloride, germanium tetrachloride, tin tetrabromide, zinc chloride and ferric chloride, ferric chloride being preferred. From 0.01% to 2%, particularly from 0.04% to 1%, based on the total weight of the reaction mixture may suitably be used.
- the, or one of the dihydroxy compounds may be a polyethylene oxide, preferably one wherein the ratio of number average weight to functionality is greater than 1000.
- the polyurethanes so produced are useful in the performance of the invention disclosed in GB.2047093 and GB.2047094.
- the solvent which may be a mixture of one or more compounds (including latent solvents) the composition of which may be varied, continuously or continually, as the polymerisation proceeds, which is a particularly critical feature of this invention.
- the solvent may qualitatively be assigned to one of three groups according to its hydrogen bonding capacity:
- solubility parameter (which is the square root of the cohesive energy density) of a number of solvents is given in Table 1 below.
- solubility parameter ranges are given for a number of bulk polymers.
- an appropriate solvent for the performance of the present invention may readily he selected by first bulk polymerising the monomer mixture to a solid mass and then determining the swellability of portions of that mass in a number of solvents. Those solvents which swell it in excess of 100 pph of polymer will he suitable for the performance of the present invention, provided that they do not contain reactive groups which will interfere with the polymerisation. To obtain high molecular weight cross-linked particles which are capable of forming sols in the solvent, it is desirable to maintain a thermodynamically good solvent at all stages of the reaction.
- Specific solvents whose use in the polymerisation of cyclic (thio)ethers and (meth)acrylate esters has been found desirable comprise one or more C 1 to C 4 alkyl acetates, especially methyl acetate and/or ethyl acetate.
- one or more halogenated hydrocarbons such as methylene chloride and/or chloroform were found very suitable.
- polyisocyanates a mixture of one or more sulphoxides with one or more ketones, or chloroform, were found very suitable.
- the polymerisation system does not require the presence, as is generally the case with non-aqueous dispersion or aqueous emulsion polymerisations, of an added stabiliser.
- the polymerisation in accordance with this invention may be monitored, particularly at laboratory or pilot plant scale, by observing whether an aliquot of the reactant mixture spread onto a glass slide will form a coherent film.
- the solvent has been selected in the manner hereinhefore defined, the formation of coherent films occurs well before gelation.
- polymerisation quenching agents may be added: base for cationic addition polymerisation; weak acids for anionic addition polymerisation; and free radical traps such as alkylated phenolic or quinonoid inhibitors for free radical polymerisation.
- this invention provides a polymeric material having a weight average molecular weight from 5,000 to 20,000,000 and comprising cross-linked particles which are capable of forming a sol whenever prepared by the process herein described. More particularly, this invention provides a polymeric material having a weight average molecular weight from 5,000 to 20,000,000 comprising particles of a homo- or copolymer of a substituted or unsubstituted (meth)acrylate ester cross-linked by a bis- or tris- vinyl or vinylidene group-containing ester which are capable of forming a sol in a solvent which (a) has a solubility parameter from 2.5 cal 1/2 ml -3/2 below to 1.0 cal 1/2 ml -3/2 above the solubility parameter of the bulk polymeric material and (b) is of the same or adjacent hydrogen bonding group as the bulk polymeric material, especially wherein the cross-linking ester comprises the bis-methacrylate ester of polyethylene glycol, the bis-methacrylate ester of
- This invention also provides a polymeric material having a weight average molecular weight from 5,000 to 20,000,000 comprising cross-linked particles of a homo- or copolymer of a polymerisable cyclic (thio)ether which are capable of forming a sol in a solvent which (a) has a solubility parameter from 2.5 cal 1/2 ml -3/2 below to 1.0 cal 1/2 ml -3/2 above the solubility parameter of the bulk polymeric material and (b) is of the same or adjacent hydrogen bonding group as the bulk polymeric material, especially wherein the cyclic (thio)ether comprises acrolein tetramer.
- This invention further provides a polymeric material having a weight average molecular weight from 5,000 to 20,000,000 comprising cross-linked particles of a homo-or copolymer of an epoxide or episulphide which are capable of forming a sol in a solvent which (a) has a solubility parameter from 2.5 cal 1/2 ml -3/2 below to 1.0 cal 1/2 ml -3/2 above the solubility parameter of the bulk polymeric material and (b) is of the same or adjacent hydrogen bonding group as the bulk polymeric material.
- This invention also provides polymeric material having a weight average molecular weight from 5,000 to 20,000,000 comprising cross-linked particles of a homo- or copolymer of a polyisocyanate which are capable of forming a sol in a solvent which (a) has a solubility parameter from 2.5 cal 1/2 ml -3/2 below to 1.0 cal 1/2 ml -3/2 above the solubility parameter of the hulk polymeric material and (b) is of the same or adjacent hydrogen bonding group as the hulk polymeric material.
- sol-forming particles By selecting the solvent in accordance with this invention gelation, which in prior art processes rapidly follows the formation of the aforesaid cross-linked, sol-forming particles, is delayed for a sufficient period to enable the termination to he effected in a controlled manner.
- the sol-forming particles so produced have a very small particle size in the colloidal or sub-colloidal size range; that is an average primary particle size no greater than 0.2 ⁇ .
- the reacted solutions so formed can either be used as such, in concentrated form, or the polymer can he recovered. Recovery can he effected by solvent evaporation or mixing, either by addition or reverse addition, with an excess of a non-solvent.
- a particularly desirable feature of the invention is that the polymer produced by addition of excess non-solvent is typically a flowable powder, generally of fine particle size. Moreover, the polymer powder can readily he redissolved in the same or other solvent selected in accordance with this invention.
- the polymer particles are globular when in solution and it is found that they typically contribute little to the viscosity of the solution until their swollen phase volume exceeds a critical fraction of the whole which, in practice, means that the polymer solution can he concentrated to about 20%, and sometimes to about 30%, by weight and still he readily pourable.
- the polymer powders of this invention are useful as industrial and pharmaceutical compression moulding materials. They may be used in admixture with an active substance; for example, a pharmaceutical, bacteriostat, viruscide, insecticide, herbicide, larvicide, fungicide, algaecide, nematocide, topical or dermatological agent, antifoulant for marine growth prevention, enzyme, preservative, fluorescent or other pigment.
- active substance for example, a pharmaceutical, bacteriostat, viruscide, insecticide, herbicide, larvicide, fungicide, algaecide, nematocide, topical or dermatological agent, antifoulant for marine growth prevention, enzyme, preservative, fluorescent or other pigment.
- the polymer powders of this invention are particularly useful as pharmaceutical tableting excipients, especially as direct compression tableting excipients. This is particularly the case for polymers prepared from cyclic (thio)ethers, such as acrolein tetramer.
- the active substance may be incorporated by admixing solid active substance, for example pharmaceutical or pigment, for example before tableting or the active substance may be added to a solution of the polymer, coprecipitated therewith and then tableted. In the latter case the swollen sol particles permit the active substance to penetrate the polymer network.
- the polymer powders are also useful as additives for hulk rubbers, sound damping formulations, viscosity control additives.
- This invention also provides a polymeric material as herein defined which is dissolved in a solvent which is different from the reaction solvent.
- This solvent may comprise one or more monomers which may he reactive with the polymeric material. Desirably, at least one of the monomers is a (meth)acrylate ester styrene, alkyl styrene, vinyl chloride or acrylonitrile.
- This invention also provides a surface coating composition such as an adhesive paint, varnish or lacquer, especially alkyl and acrylic based surface coatings, which comprise a polymeric material, which may comprise pigment introduced as aforesaid, especially one in a solvent which is different from the reaction solvent as aforesaid.
- a surface coating composition such as an adhesive paint, varnish or lacquer, especially alkyl and acrylic based surface coatings, which comprise a polymeric material, which may comprise pigment introduced as aforesaid, especially one in a solvent which is different from the reaction solvent as aforesaid.
- This invention further provides a cured such surface coating composition; such materials typically have a reduced drying time, generate less heat and reduce shrinkage. It is to be noted that even if the solvent monomers do not interpolymerise with the polymeric material of this invention they will penetrate the polymer network and their resultant homopolymers will hind the polymer particles by entanglement.
- the concentration of polymer in the solution was 8.2% by weight. It was possible to concentrate the polymer solution after neutralisation to about 24% by weight by distilling the excess methyl acetate or by using a rotary evaporator.
- Polymer powder was obtained from the solution either by a film spreading technique or by precipitating the polymer solution by gradual addition to an excess of hexane.
- the concentration of polymer in the solution was 8.3% by weight.
- the polymer solution could he concentrated to about 24% by weight either by distillation or using a rotary evaporator.
- Polymer powder was obtained as described in Example 1.
- copolymers with acrolein tetramer:glycerol weight ratios 70:30, 72:28, 74:26 and 76:24 were also prepared. These copolymers usually had lower molecular weights than the 3:2 copolymer produced in this and Example 1 above.
- the preparation was carried out in two stages:
- a master hatch of citric acid and acrolein tetramer in ethyl acetate was prepared for use in the preparation of citric acid acrolein tetramer copolymer.
- the ratio acrolein tetramer:citric acid in the master batch was stoichiometric (2 mols of acrolein tetramer to 1 mol of citric acid on the assumption that the three carboxylic groups and one hydroxyl group in citric acid would react).
- 35.0965 g (0.1567 mols) of acrolein tetramer were added to 15.0506 g citric acid (0.0783 mols), and the mixture was then added to 450 cm 3 of ethyl acetate.
- the mixture was next placed in a round-bottom flask and refluxed with continuous stirring under a nitrogen bleed. The refluxing and stirring was stopped after half an hour to provide a homogeneous prepolymer which formed only a low molecular weight tacky film.
- the notional concentration of acrolein tetramer and citric acid was 10% w/v.
- the polymer concentration was 3.5% w/v and could be concentrated to about 10% w/v using a rotary evaporator.
- Polymer powder was obtained by precipitation by gradually adding the solution to an excess of hexane.
- Copolymers of acrolein tetramer/citric acid/glycerol of different ratios were prepared.
- acrolein tetramer 1.17 g of acrolein tetramer were added to 0.5 g of anhydrous citric acid and 0.5 g glycerol containing 2% by weight of FeCl 3 in a reaction vessel equipped with a nitrogen bleed and a drying tube to exclude moisture. 20 cm 3 of ethyl acetate were added to form a mixture which, initially, was not homogeneous. The mixture was continuously stirred and heated on a water bath whereupon it became homogeneous after about half an hour and was permitted to reflux. After one hour of refluxing a further 2.38 g of acrolein tetramer were added together with 30 cm 3 methylene chloride.
- the ratio of acrolein tetramer to the other components was thus 78%.
- the solution was film-forming.
- the solution was then neutralised by adding a few drops of triethylamine.
- the concentration of the polymer in the solution was 9% w/v.
- Polymer powder was obtained by precipitation by adding excess hexane.
- acrolein tetramer 1.00 g was added to 0.41 glycerol containing 2% by weight FeCl 3 and 0.59 g of anhydrous citric acid in a reaction vessel equipped with a nitrogen bleed and a drying tube to exclude moisture. 50 cm 3 ethyl acetate were added to form a mixture which, initially, was not homogeneous. The mixture was continuously stirred and heated on a water bath whereupon it became homogeneous after about 10 minutes and was permitted to reflux. After 25 minutes of refluxing a further 2.55 g of acrolein tetramer were added, along with 25 cm 3 methylene chloride and 0.4 cm 3 0.3% ferric chloride solution in methylene chloride.
- the ratio of acrolein tetramer to the other components was thus 78% of the total content of acrolein tetramer/citric acid/glycerol. After 10 minutes refluxing after the second addition the mixture was film-forming. The solution was then neutralised with triethylamine.
- Polymer powder was obtained by precipitation by adding excess hexane.
- copolymers of acrolein tetramer/citric acid/glycerol with a higher content of citric acid than glycerol were prepared, provided that the necessary additional amount of ferric chloride was added in the second stage.
- acrolein tetramer (0.01 mol) and 10.0 cm 3 of a 0.1% FeCl 3 solution in methyl acetate were mixed in a reaction vessel.
- concentration of acrolein tetramer in the solution was 22 wt. %.
- the mixture was then allowed to react at a temperature of 20° C. and after 65 minutes a turbid solution was formed. After 70 minutes 1.14 cm 3 (0.02 mol) of ethanol as added to terminate the polymerisation.
- Polymer powder was obtained by adding excess alcohol or hexane to the solution.
- epoxy curing agent FC503 (Trade Mark, 3M Company);
- the three components were admixed, in the proportions by weight given in the Table below, and the methyl acetate was evaporated off in the dark in an oven with forced ventilation.
- the resulting materials were golden yellow in colour.
- the products were coated as thin films on an aluminium sheet and were found to cure rapidly to a tack-free, scratch-resistant film after one passage under a U.V. lamp in a line travelling at 300 feet per minute.
- the mixture was film-forming after 20 minutes and was neutralised, with triethylamine, after 3 hours of polymerisation.
- Various polymers based on Epikote 828 were prepared using the above procedure but altering the polymerisation time from 1 hour to 5 hours.
- the BF 3 solution was prepared by diluting BF 3 methanol solution to a 45% solution with methylene chloride.
- the Epikote 828 solution was prepared in methylene chloride.
- the polymer concentration was 6.5% w/v.
- Polymer powder was obtained by precipitation by adding excess hexane, slowly with continuous stirring. The polymer powder could he readily dispersed again in methylene chloride.
- Polyethylene glycol 6000 (ex ICI) and trimethylol propane were dried under vacuum for 1 hour at 70° C.
- Diphenylmethane-4, 4'-diisocyanate (MDI) was distilled under reduced pressure and used immediately.
- Polyethylene glycol 6000 (10 g) was placed in a 250 cm 3 glass flask equipped with stirrer, nitrogen bleed, condenser and CaCl 2 drying tube to exclude moisture with a mixture of dimethylsulphoxide and methyl ethyl ketone in a weight ratio of 1:1 (50 g) and heated to 70° C. MDI (1.15 g) was then added followed, after 5 minutes, by trimethylol propane (0.27 g). The mixture was next heated at 80°-100° C. for 5 hours by which time no infra-red isocyanate absorption hand at 2275 nm could he detected and polymer solution had formed.
- Polymer powder was obtained by slowly adding the polymer solution to an excess of cyclohexane or petrol ether (60/80) followed by filtration and drying in a vacuum oven at room temperature.
- the powder so formed would readily redisperse to a stable system in either 1:1 dimethylsulphoxide/methyl isobutyl ketone or into water.
- the dispersion in water had the interesting characteristic of being clear at room temperature hut of milky appearance at 100 ° C.
- the dispersion is useful as a thickener in water as it can provide very viscous dispersions at room temperature which show a remarkable reduction in viscosity at elevated temperature.
Abstract
A solution polymerization process for the preparation of a polymeric material having a weight average molecular weight from 5,000 to 20,000,000 and comprising cross-linked particles which are capable of forming a sol in the reaction solvent, which process comprises:
(i) polymerizing one or more monomers, the or at least one of which is a cross-linking agent, in a solvent which (a) has a solubility parameter from 2.5 cal1/2 ml-3/2 below to 1.0 cal1/2 ml-3/2 above the solubility parameter of the bulk polymeric material and (b) is of the same or adjacent hydrogen bonding group as the bulk polymeric material;
(ii) monitoring the polymerization until polymeric material as herein defined is obtained; and
(iii) terminating the polymerization before gelation is observed.
Description
This is a division of Application Ser. No. 08/195,452 filed on Feb. 14 1994, now abandoned, which is a Continuation of application Ser. No 07/425,356, filed Oct. 20, 1989, abandoned; which is a Continuation of application Ser. No. 07/059,181, filed Jun. 12, 1987, abandoned; which is a continuation of application Ser. No. 06/906,598, filed Sep. 10, 1986, abandoned; which is a Continuation of application Ser. No 06/767,705, filed Aug. 22, 1985, abandoned; which is a Continution of applicaiton Ser. No. 06/655,990, filed Sep. 28, 1984, abandoned which is a Continuation of application Ser. No. 06/552,020, filed Nov. 17, 1983, abanonded; which is a Continuation of application Ser. No. 06/335,526 filed Dec. 21, 1981.
This invention relates to polymeric materials; more particularly this invention relates to polymeric materials comprising cross-linked particles which are capable of forming sols; to processes for their preparation; and to compositions comprising them.
According to one aspect of this invention, there is provided a solution polymerisation process for the preparation of a polymeric material having a weight average molecular weight from 5,000 to 20,000,000 and comprising cross-linked particles which are capable of forming a sol in the reaction solvent, which process comprises:
(i) polymerising one or more monomers, the or at least one of which is a cross-linking agent, in a solvent which (a) has a solubility parameter from 2.5 cal1/2 ml-3/2 below to 1.0 cal1/2 ml-3/2 above the solubility parameter of the bulk polymeric material and (b) is of the same or adjacent hydrogen bonding group as the bulk polymeric material;
(ii) monitoring the polymerisation until a polymeric material as herein defined is obtained; and
(iii) terminating the polymerisation before gelation is obtained.
The solution polymerisation process of the invention may be an addition, for example a cationic, anionic or free radical, polymerisation or a condensation polymerisation.
A class of addition polymerisation to which the present invention may advantageously be applied is cationic addition polymerisation to which the following types of monomer, inter alia, are susceptible:
(a) cyclic and linear mono- and poly-vinyl (thio)ethers, including furfural and furfuryl alcohol;
(b) other compounds comprising at least one 3- or 4- membered oxa-or thia- substituted ring, for example mono- and poly-epoxides and lactones with a 4-membered ring;
(c) cyclic aliphatic anhydrides, for example maleic anhydrides;
(d) aliphatic aldehydes; and
(e) mono- and poly-vinyl aromatic hydrocarbons, such as styrene, alkyl styrenes, such as vinyl toluene, divinyl benzene and indene.
Mixtures of such monomers may be used.
In accordance with a preferred aspect of this invention the, or one of the, monomers comprises a polymerisable cyclic (thio)ether. By "(thio)ether" is meant herein an ether or a thioether. Suitable polymerisable cyclic (thio)ethers have the formula: ##STR1## in which: R1, R2 and R4, which may be the same or different, each represent a hydrogen atom or a substituted or unsubstituted hydrocarbyl or hydrocarbyloxy group;
R3 represents a substituted or unsubstituted methylene, ethylene or 1,3-propylene group;
R5 represents a monovalent polymerisable group;
Q represents an oxygen or a sulpur atom; and
X represents: ##STR2## in which: Y represents an oxygen atom or a --NR6 -group wherein R6 represents any of the values which R1 may assume;
a is 0 or 1;
b is 0 or 1;
c is 1 or 2;
d is 0 or 1;
with the proviso that at least one of b or d is 1.
The groups R1, R2 and R4 may each represent a substituted or unsubstituted hydrocarbyl or hydrocarbyloxy group: examples include unsubstituted or halo-substituted C1 to C4 alkyl, such as methyl or ethyl; unsubstituted or halo-substituted C6 to C10 aryl or aralkyl, such as phenyl or benzyl; and oxy analogues. In the case of R4, increase in the size of the group increases the steric hindrance to the hydrolysable ester or amide function X and thereby increases the stability of the polymer. It is preferred, however, from the standpoint of ease of preparation and availability, that at least one, and preferable all, of R1 R2 and R4 represents a hydrogen atom. The group R3 may represent a mono- or poly- substituted ethylene group, preferably an unsubstituted ethylene group; that is, a dihydro(thia)pyran derivative.
Preferred such compounds are ethers; that is, those compounds of the above formula wherein Q represents an oxygen atom, especially dihydropyrans.
X may, as shown, represent any hydrolysable carboxylic acid ester, carbonate ester or oxalate ester function, or an amide analogue. Preferably, however, X represents --COO--or --CH2 OCO--.
Particularly preferred polymerisable cyclic ethers have the formula: ##STR3## R5 may suitably represent any group which can participate in cationic polymerisation; for example those derivable from monomers (a) to (e) mentioned hereinbefore. Preferred examples are vinyl (thio)ether and epoxy groups.
It is particularly preferred that R5 represents a cyclic vinyl (thio)ether, especially of the formula: ##STR4## in which:
R1 ', R2 ', R3 ' and R4 ', which may be the same or different, represent any of the values which R1, R2, R3 and R4 may assume;
M represents the group --ZX'--;
Q' represents an oxygen or sulphur atom;
X' represents any of the values which X may assume; and
Z represents a single bond or a substituted or unsubstituted hydrocarbylene.
Especially preferred polymerisable cyclic ethers are the reaction products formed by subjecting one or a mixture of dihydropyran aldehydes to disproportionation by the Tischenko reaction; they have the formula: ##STR5## in which: R1 ', R2 ' and R4 ', which may be the same or different, represent any of the values which R1, R2 and R4 respectively may assume. A preferred such compound is acrolein tetramer (in which the Ri all represent hydrogen atoms).
Polymerisable cyclic ethers wherein X comprises a --COO--or --CH2 OCO--group may conveniently be prepared from the tetramer of the corresponding unsaturated aldehyde produced by the Tischenko reaction; namely: ##STR6##
Thus, cyclic ethers wherein X comprises a --COO--group may be prepared by reaction of the tetramer with an alcohol R5 OH using a transesterification catalyst and reaction conditions: ##STR7##
Cyclic ethers wherein X comprises a --CH2 OCO--group may be prepared by reaction of the tetramer with a lower alkyl carboxylic acid ester R5 COOR7 in which R7 represents a lower alkyl group using a transesterification catalyst and reaction conditions: ##STR8##
The respective by-products may also be transesterified with R5 COOR7 or R5 OH to give, correspondingly: ##STR9##
The corresponding amides may be prepared analogously.
Cyclic ethers where X comprises a --COO--group may also be obtained by mild oxidation of the dimer of the corresponding unsaturated aldehyde, followed by esterification of the salt, for example the silver salt.
Meta-carbonates and oxalates may be obtained, respectively, by esterification and transesterification: ##STR10##
It is, however, to be stressed that acrolein tetramer is readily prepared from acrolein which is a commercially available material; can readily be purified; and has been found to be satisfactory in the practice of this invention.
Other specific examples of polymerisable cyclic ethers include bis-(3,4-dihydropyran-2-ylmethyl) succinate, bis-(3, 4-dihydropyran -2-ylmethyl) o-terephthalate, bis-(3,4-dihydropyran-2-yl) adipate, bis-(3,4-dihydropyran-2-ylmethyl) adipate, ##STR11## wherein:
n represents a number of at least one; and R8 is a polyvalent organic bridging group which desirably does not contain a basic group since these can interfere with the acid catalysis required, as will be explained later, for the polymerisation.
A further class of addition polymerisation to which the present invention may also advantageously be applied is free radical addition polymerisation. Suitably the, or one of the, monomers comprises a vinyl- or vinylidene group-containing monomer, preferably a substituted or unsubstituted (meth)acrylate ester, especially a C1 to C8 alkyl methacrylate. Specific examples of such monomers include methylacrylate, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, n-hexyl methacrylate, ethyl hexyl methacrylate, lauryl methacrylate, phenyl acrylate, isodecyl methacrylate, 2-ethoxyethyl methacrylate, 2-n-butoxy ethyl methacrylate, 2-(2-ethoxyethoxy)ethyl methacrylate, 2-phenoxyethyl acrylate and 2-phenoxyethyl methacrylate. Such monomers require the presence of a bis- or tris-vinyl or vinylidene group-containing monomer as cross-linking agent. This may be a hydrocarbon, for example an unsubstituted or hydrocarbyloxylated aromatic hydrocarbon such as divinyl benzene. Preferably, however, the cross-linking agent comprises a bis- or tris- vinyl or vinylidene group-containing ester, particularly preferred examples being the bis-methacrylate ester of polyethylene glycol, the bis-methacrylate ester of ethylene glycol or triallyl cyanurate.
Cationically polymerisable monomers in classes (b) and (e) above may also be free radical polymerised. Of these, epoxides and episulphides are particularly versatile, being also susceptible to anionic addition polymerisation, for example with organometallic initiators. Suitable monoepoxides include the alkylens oxides such as ethylene oxide, propylene oxide and butylene oxides; the aromatic oxides such as styrene oxide. Polyepoxides include many commercially available (cyclo)aliphatic and aromatic polyepoxides, such as: ##STR12##
Analogous mono- and polyepisulphides may also be used, especially ethylene and propylene sulphides.
There are many classes of condensation polymerisation to which the present invention is applicable; for example, condensation polymerisations for the production of polyamides, polyesters, polycarbonates, phenol-formaldehydes, urea-formaldehydes, urea-melamines and polyurethanes, particularly the latter. In the preparation of polyurethanes according to the invention one of the monomers comprises a polyisocyanate, for example a diisocyanate such as a (cyclo)aliphatic, araliphatic or aromatic diisocyanate. Specific examples include 2,4, and 2,6 toluene diisocyanate; (cyclo)aliphatic diisocyanates such as 1,6-hexamethylene diisocyanate, isophorone diisocyanate, 4,4'-dicyclohexyl methane diisocyanate, and cyclohexylene 1,2- and 1,4- diisocyanate; and araliphatic diisocyanates such as 4,4'-diphenylmethane diisocyanate.
A versatile group of cross-linking agents, particularly for polyurethanes and also for cationically polymerisable species, such as the cyclic (thio)ethers, are monomers comprising at least three groups containing a reactive hydrogen atom such as a hydroxy, carboxy, amino or mercapto group (amino not being preferred for cationic polymerisation), for example those comprising at least three groups which are hydroxyl, and/or carboxyl groups.
Examples include polycarboxylic acids, polyhydric phenols, hydroxy acids and polyhydric alcohols, desirably those with less than 18, preferably less than 10, carbon atoms; for example aliphatic polyols such as glycerol, erythritol, pentaerythritol, sorbitol, dulcitol, inositol, 2-ethyl-2-hydroxy-methylpropane-1,3-diol and 1,2,6-hexanetriol; aromatic polyols such as 1,2,3-trihydroxybenzene, 1,2,4-trihydroxybenzene, 1,3,5-trihydroxybenzene; araliphatic polyols; hydroxy aliphatic, alicyclic and aromatic carboxylic acids, including Krebs cycle acids, such as citric acid, malic acid, tartaric acid, 2-hydroxy-3-methyl (D) succinic acid, ascorbic acid, 2,3,-dihydroxybenzoic acid, 2,4,-dihydroxy-benzoic acid, 2,5-dihydroxybenzoic acid, 2,6-dihydroxybenzoic acid, 2,3,4-trihydroxybenzoic acid, 2,4,5-trihydroxybenzoic acid, 2,4,6-trihydroxybenzoic acid and 3,4,5-trihydroxybenzoic acid. Mixtures of polycarboxylic acids, polyhydric phenols, hydroxy acids and polyhydric alcoyols may be used. Preferably the polycarboxylic acids, polyhydric phenols, hydroxy acids and polyhydric alcohols are linear.
Monomers comprising two groups containing reactive hydrogen atoms as aforesaid, for example di-carboxy or hydroxy substituted monomers may be utilised, especially as comonomers with cyclic(thio) ethers, epoxides or polyisocyanates, for example to produce polymers of the type disclosed in U.K. 1,572,598 and U.S. Pat. No. 4,221,779.
Examples of di-carboxy or hydroxy monomers include dicarboxylic acids, dihydric phenols, hydroxyacids, glycols and polyesters thereof, desirably those with less than 18, preferably less than 10, carbon atoms; for example oxalic, malonic, succinic, glutaric, and adipic acids, 1,2-cyclohexanedicarboxylic, 1,3-cyclohexanedicarboxylic and 1,4-cyclohexanedicarboxylic acids, phthalic, isophthalic and terephthalic acids, 4,4'-dihydroxyphenyl-2,2-propane, resorcinol, quinol and orsinol, lactic, 2-hydroxyisobutyric, 10-hydroxydecanoic, 12-hydroxyoctadecenoic, 12-hydroxy-cis-9-octadecenoic, 2-hydroxycyclohexane carboxylic, 2-hydroxy-2-phenyl (D) propionic, diphenylhydroxyacetic, 2-hydroxybenzoic, 3-hydroxy-benzoic and 4-hydroxybenzoic acids, glycol, propanediols and butanediols. Glycols are most suitable, especially the C2 to C6, preferably C2 to C4 glycols. Mixtures of dicarboxylic acids, dihydric phenols, hydroxy acids and glycols may be used. Preferably the dicarboxylic acids, dihydric phenols, hydroxy acids and glycols are linear.
Cationic addition polymerisation in accordance with this invention requires acid catalysis. Suitable Bronsted and Lewis acids include strong mineral acids which are not redox reagents under the reaction conditions such as hydrochloric and sulphuric acid, tosylic acid, brosylic acid and the adduct of methanol and boron trifluoride. Suitable Lewis acids include boron trifluoride and its etherate, boron tribromide, aluminium trichloride, aluminium tribromide, gallium trichloride, germanium tetrachloride, tin tetrabromide, zinc chloride and ferric chloride, ferric chloride being preferred. From 0.01% to 2%, particularly from 0.04% to 1%, based on the total weight of the reaction mixture may suitably be used.
In the case of the production of polyurethanes the, or one of the dihydroxy compounds may be a polyethylene oxide, preferably one wherein the ratio of number average weight to functionality is greater than 1000. The polyurethanes so produced are useful in the performance of the invention disclosed in GB.2047093 and GB.2047094.
It is the nature of the solvent, which may be a mixture of one or more compounds (including latent solvents) the composition of which may be varied, continuously or continually, as the polymerisation proceeds, which is a particularly critical feature of this invention. The solvent may qualitatively be assigned to one of three groups according to its hydrogen bonding capacity:
______________________________________ GROUP EXAMPLES ______________________________________ strongly bydrogen bonded alcohols, acids, amines, aldehydes moderately hydrogen bonded ketones, esters, ethers, poorly hydrogen bonded hydrocarbons, chlorinated and nitrohydrocarbons, nitriles ______________________________________
from which the meaning of "same or adjacent hydrogen bonding group" will be apparent.
The solubility parameter (which is the square root of the cohesive energy density) of a number of solvents is given in Table 1 below. In Table 2 solubility parameter ranges are given for a number of bulk polymers. (Both from "Encyclopaedia of Polymer Science and Technology" published by John Wiley & Sons.)
TABLE I ______________________________________ Solvents Solubility parameter ______________________________________ Hydrocarbons aliphatic n-pentane 7.05 isopentane 7.05 n-hexane 7.3 cyclohexane 8.2 n-heptane 7.45 n-octane 7.55 isooctane 6.85 n-nonane 7.65 n-decane 7.75 n-tetradecane 7.95 butadiene 6.7 isoprene 7.25 aromatic benzene 9.15 toluene 8.9 o-xylene 9.0 m-xylene 8.8 p-xylene 8.75 ethylbenzene 8.8 naphthalene 9.9 n-propylbenzene 8.65 isopropylbenzene 8.86 mesitylene 8.8 p-cymene 9.85 styrene 8.66 Perfluoro compounds n-perfluorobutane 5.2 n-perfluoropentane 5.5 n-perfluorohexane 5.6 n-perfluoroheptane 5.7 n-perfluorononane 5.7 perfluorocyclobutane 5.7 perfluorocyclohexane 6.0 Perfluoro compounds perfluorobenzene 8.1 perfluorotoluene 7.7 Halogen compounds aliphatic chlorides dichloromethane 9.7 chloroform 9.3 carbon tetrachloride 8.6 ethyl chloride 8.5 1,1-dichloroethane 9.1 1,2-dichloroethane 9.8 1,1,1-trichloroethane 8.5 tetrachloroethane 10.4 iobutyl chloride 8.2 t-butyl chloride 7.9 unsaturated chlorides cis-dichloroethylene 9.7 trans-dichloroethylene 9.2 trichloroethylene 9.2 tetrachloroethylene 9.35 vinyl chloride 8.7 vinylidene chloride 8.6 chloroprene 9.3 aromatic compounds chlorobenzene 9.5 bromobenzene 10.0 iodobenzene 11.3 o-bromotoluene 9.8 aliphatic bromides methyl bromide 9.4 bromoform 10.5 ethyl bromide 8.9 1,2-dibromoethane 10.4 1,1,2,2-tetrabromoethane 10.3 1,2,3-tribromopropane 10.7 aliphatic iodides methyl iodide 9.9 diiodomethane 11.8 ethyl iodide 9.4 Hydroxyl compounds water 23.2 phenol 14.5 glycol 15.7 glycerol 16.5 cyclohexanol 11.4 methanol 14.5 ethanol 12.7 n-propanol 11.9 n-butanol 11.4 isobutyl alcohol 10.7 n-amyl alcohol 10.9 n-hexanol 10.7 n-heptanol 10.0 n-octanol 10.3 Acids acetic acid 12.6 n-butyric acid 11.5 isovaleric acid 10.9 n-valeric acid 10.8 Esters methyl formate 10.7 ethyl formate 9.4 methyl acetate 9.6 ethyl acetate 9.1 n-propyl acetate 8.75 isopropyl acetate 8.6 ethyl propionate 8.9 amyl formate 8.65 n-butyl acetate 8.55 ethyl n-butyrate 8.15 amyl acetate 8.45 butyl propionate 8.5 ethyl isovalerate 8.65 amyl propionate 8.4 n-butyl n-butyrate 8.0 isobutyl isobutyrate 7.7 isoamyl butyrate 8.5 ethyl benzoate 9.7 diethyl carbonate 8.8 diethyl malonate 10.3 ethylene carbonate 14.5 diethyl phthalate 10.05 vinyl acetate 8.7 methyl acrylate 8.9 ethyl acrylate 8.4 methyl methacrylate 8.7 ethyl methacrylate 8.4 n-butyl acrylate 8.9 n-butyl methacrylate 8.2 isobutyl methacrylate 7.9 Aldehydes benzaldehyde 10.8 acetaldehyde 9.8 n-heptaldehyde 9.7 Ketones acetone 10.0 methyl ethyl ketone 9.3 diethyl ketone 8.8 methyl n-propyl ketone 8.7 methyl n-butyl ketone 8.6 methyl amyl ketone 8.5 methyl hexyl ketone 8.45 cyclohexanone 9.9 Ethers diethyl ether 7.4 diisopropyl ether 7.0 β, β'-dichloroethyl ether 9.8 dioxane 10.0 tetrahydrofuran 9.9 Amines di-n-butylamine 7.85 aniline 10.8 pyridine 10.7 Amides formamide 17.8 acetamide 16.7 dimethylformamide 12.1 dimethylacetamide 11.1 Nitriles acetonitrile 11.9 propionitrile 10.7 n-butyronitrile 10.5 n-valeronitrile 10.1 capronitrile 10.2 malonitrile 15.1 acrylonitrile 10.45 methacrylonitrile 9.1 Nitro compounds nitromethane 12.6 nitroethane 11.1 1-nitropropane 10.2 2-nitropropane 9.9 nitrobenzene 10.0 o-nitrotoluene 10.5 m-nitrotoluene 10.4 Sulfur compounds carbon disulfide 10.0 ethyl mercaptan 8.65 dimethyl sulfide 9.0 diethyl sulfide 8.8 thiophene 9.8 dimethyl sulfone 14.6 diethyl sulfone 12.5 dipropyl sulfone 11.3 dimethyl sulfoxide 13.4 ______________________________________
TABLE 2 __________________________________________________________________________ Solubility Parameter Polymers Manufacturer Poor Moderate Strong __________________________________________________________________________ Acrylics acrylic solution polymers Acryloid B-44 Rohm & Haas 8.9-11.9 8.5-13.3 0 Acryloid B-66 Rdhm & Haas 8.5-11.1 7.8-12.1 0 Acryloid B-72 Rohm & Haas 8.5-12.7 8.9-13.3 0 Acryloid B-82 Rohm & Haas 8.5-11.1 8.9-12.1 0 poly(butyl acrylate) Rohm & Haas 7.0-12.7 7.4-12.1 9.5-12.7 poly(methacrylic acid) Rohm & Haas 0 9.9 12.7-14.5 poly(methyl methacrylate) Rohm & Haas 8.9-12.7 8.5-13.3 0 poly(ethyl methacrylate) Rohm & Haas 8.5-11.1 7.8-13.3 9.5-11.4 poly(n-butyl methacrylate) Rohm & Haas 7.4-11.1 7.4-9.9 9.5-11.4 poly(isobutyl methacrylate) Rohm & Haas 8.5-11.1 8.5-9.9 9.5-11.4 Alkyd resins 30% soy, glycerol phthalate 8.5-12.7 8.5-14.7 0 45% soy, glycerol phthalate 7.0-11.1 7.4-10.8 9.5-11.9 45% soy, pentaerythritol phthalate 7.0-11.1 7.4-10.8 9.5-11.9 45% linseed, glycerol phthalate 7.0-11.9 7.4-10.8 9.5-11.9 Epoxy resins bisphenol A-epichlorohydrin condensates Epon E-72 Shell Chemical 8.5-10.6 7.4-9.9 9.5-11.4 Epon 812 Shell Chemical 8.9-12.7 7.8-14.7 10.0-14.5 Epon 864 Shell Chemical 9.5-12.7 8.5-14.7 0 Epon 1001 Shell Chemical 10.6-11.1 8.5-13.3 0 Epon 1004 Shell Chemical 0 8.5-13.3 0 Epon 1007 Shell Chemical 0 8.5-13.3 0 Epon 1009 Shell Chemical 0 8.5-9.9 0 Hydrocarbon resins cyclized rubber Reichhold 7.4-10.6 7.8 0 Alpex cyclized rubber hydrocarbon resin Gilsonite Brilliant Black American Gilsonite 7.8-10.6 7.8-8.5 0 Gilsonite Selects American Gilsonite 7.8-9.5 7.8-8.5 9.5 Nebony 100 Neville Chemical 8.5-10.6 7.8-9.9 0 Neville LX685 Neville Chemical 7.4-10.6 9.3-9.9 0 Panarez 3-210 Amoco Chemical 8.5-10.6 0 0 Petrolatum 125 IIMP 8.5-8.9 0 0 natural rubber Pliolite NR Goodyear 85.-10.6 0 0 Pliolite P-1230 Goodyear 9.5-10.6 0 0 Phenolic resin p-phenylphenol resin Union Carbide 8.5-10.0 7.8-13.3 9.5-10.8 Bakelite CKR-525/4 phenolic resin Bakelite CKR-5360 Union Carbide 8.5-11.1 7.8-13.3 9.5-11.4 Bakelite CKR-2400 Union Carbide 8.9-11.9 7.8-13.3 9.5-11.5 Bakelite BKR2620 Union Carbide 0 8.4-14.7 9.5-14.5 terpene-phenol resin Hooker Chemical 8.5-10.6 7.8-9.8 9.5-11.4 Durez 220 phenolic resin Hooker Chenical 7.0-11.9 7.4-9.8 9.5-14.5 Durez 550 phenol ether resin General Electric 0 8.9-12.1 0 Methylon 75202 Polyesters linear polyester Goodyear 11.1 9.9 0 Vitel resin PE100-X poly(ethylene terephthalate) soluble Hylar 49000 Du Pont 10.6-11.1 10.6-11.1 0 soluble Hylar 49001 Du Pont 8.9-10.6 9.3-9.9 0 soluble Hylar 49002 Du Pont 9.5-10.6 9.3-9.9 0 Amino resins urea-formaldehyde resin Reichhold 9.9-11-1 8.5-10.8 9.5-12.7 Beckamine P-196 butylated urea-formaldehyde resin American Cyanamid 0 0 8.9-11.4 Beetle 227-8 butylated melamine-fomaldehyde resin Monsanto 8.5-10.6 7.4-12.1 9.5-12.7 Resunene 888 benzoguanamine-formaldehyde resin Rohm & Haas 8.5-11.1 7.4-11.1 9.5-11.1 Uformite MX-61 Cellulose derivatives cellulose acetate, LL-1 11.1-12.7 9.9-14.7 0 cellulose acetate butyrate 11.1-12.7 8.5-14.7 12.7-14.5 cellulose butyrate, 0.5 sec 11.1-12.7 8.5-14.7 12.7-14.5 cyanoethylcellulose 11.1-12.7 12.2-14.7 0 ethylcellulose, K-200 0 8.5-10.8 9.5-11.4 ethylcellulose, N-22 8.1-11.1 7.4-10.8 9.5-14.5 ethylcellulose, T-10 8.5-9.5 7.8-9.8 9.5-11.4 cellulose nitrate, RS, 25 cps 11.1-12.7 7.8-14.7 14.5 cellulose nitrate, SS, 0.5 sec 11.1-12.7 7.8-14.7 12.7-14.5 Polyamides methylolpolyamide Du Pont 0 0 11.9-14.5 nylon, type 8 dimer acid-polyamine condensates Versamid 100 General Mills 8.5-10.6 8.5-8.9 9.5-11.4 Versamid 115 General Mills 8.5-10.6 7.8-9.9 9.5-12.7 Versamid 900 General Mills 0 0 0 Versamid 930 General Mills 0 0 9.5-11.4 Versamid 940 General Mills 0 0 9.5-11.4 Versalon 1112 General Mills 0 0 9.5-11.4 Versalon 1175 General Mills 0 0 9.5-11.4 Rosin derivatives WW gum rosin 8.5-11.1 7.4-10.8 9.5-11.4 wood rosin M grade 7.4-10.6 7.4-10.8 9.5-14.5 ester gum 7.0-10.6 7.4-10.8 9.5-10.9 Alkydol 160 Reichhold 9.5 8.5-10.8 9.5-12.7 rosin-modified phenol-formaldehyde Rohm & Haas 8.5-10.6 7.8-9.8- 9.5-10.9 Amberol F-7 maleic rosin type Amberol 750 Rohm & Haas 0 8.9-10.8 9.5-12.7 Amberol S01 Rohm & Haas 8.5-11.1 7.4-9.9 0 Arochem 455 U.S. Industrial 0 7.8-13.3 9.5-14.5 Chemicals Arochem 462 U.S. Industrial 9.5 8.5-10.8 9.5-14.5 Chemicals polymerized rosin Hercules 7.4-10.6 7.8-9.9 9.5-11.4 Dymerex Nelio B952 Glidden 9.5-10.6 7.4-10.8 9.5-12.7 Nelio VBR757 Glidden 0 8.5-10.8 9.5-14.5 rosin-derived alkyd Hercules 8.5-11.1 8.5-13.3 0 Neolyn 23 α-pinene resin Tenneco 8.5-11.1 7.4-12.1 9.5-14.5 Newport V-40 pentaerythrytol ester of rosin Hercules 8.5-10.6 7.4-9.9 9.5-11.4 Pentalyn A maleic-modified pentaerythrytol ester Hercules 8.5-10.6 7.8-9.9 9.5-10.9 of rosin Pentalyn G pentaerythrytol ester of dimerized rosin Hercules 8.5-10.6 7.8-9.9 9.5 Pentalyn K rosin-based polymers Pentalyn 830 Hercules 8.5-9.5 7.8-10.8 9.5-11.4 Pentalyn 856 Hercules 8.5-11.1 7.4-10.8 9.5-11.4 Vinsol Hercules 10.6-11.9 7.8-13.3 9.5-12.7 Styrene polymers and copolymers butadiene-styrene Buton 100 Enjay 7.4-10.6 7.4-9.9 0 Buton 300 Enjay 8.5-10.6 7.4-9.9 9.5-10.5 styrene-maleic anhydride Lytron 810 Nonsanto 11.9 9.9-14.7 0 Lytron 820 Monsanto 9.5 8.9-14.7 10.9-14.5 styrene copolymer Marbon 8.5-10.6 9.3-9.9 0 Marbon 9200 styrene-acrylonitrile-indene terpolymer Penn. Industrial 8.5-11.1 7.8-9.9 0 Piccoflex 120 modified polystyrenes Styron 440M-27 Dow 8.5-10.6 9.3 0 Styron 475M-27 Dow 8.5-10.6 9.3 0 Styron 480-27 Dow 9.5-10.6 9.3 0 rubber-modified polystyrene Monsanto 8.5-10.6 9.3 0 Lustrex "High Test 88" Shell X-450 Shell Chemical 9.5-10.6 8.5-12.1 9.5-12.7 styrene-acrylonitrile copolymer Union Carbide 10.6-11.1 9.3 0 Bakelite RMD4511 (S/An) Vinyl resins poly(vinyl chloride) Exon 470 Firestone 8.5-11.1 7.8-9.9 0 Exon 471 Firestone 8.5-11.1 7.8-12.1 0 Exon 473 Firestone 8.5-11.1 7.8-9.9 0 Geon 121 Goodrich 10.6-11.1 9.3-9.9 0 vinylidene chloride-acrylonitrile poly(vinyl butyl ether) 7.8-10.6 7.4-9.9 9.5-11.4 poly(vinyl ethyl ether) 7.0-11.1 7.4-10.8 9.5-14.5 poly(vinyl formal) Formvar 7/70F Shawinigan 0 9.9-13.3 0 Formvar 15/95E Shawinigan 0 9.9-13.3 0 poly(vinyl isobutyl ether) 7.0-10.6 7.4-9.9 9.5-11.4 vinylidene chloride-acrylonitrile copolymer Saran F-120 Dow 9.5-11.1 12.1-14.7 0 Saran F-220 Dow 9.5-11.1 10.8-14.7 0 poly(vinyl acetate) Union Carbide 8.9-12.7 8.5-14.7 14.5 Vinylite AYAA partially hydrolyzed vinyl chloride-vinyl Union Carbide 10.6-11.1 7.8-9.9 0 acetate copolymer Vinylite VAGII Union Carbide 10.6-11.1 7.8-12.1 0 vinyl chloride-vinyl acetate copolymer Vinylite VYIIII vinyl chloride-vinyl acetate-maleic acid Union Carbide 9.3-11.1 7.8-13.3 0 terpolymer Vinylite VMCH vinyl chloride copolymer Union Carbide 0 8.9-10.8 9.5-14.5 Vinylite VXCC vinyl chloride-vinyl acetate copolymer Union Carbide 0 8.9-10.8 9.5-14.5 Vinylite VYLF poly(vinyl butyral) Vinylite XYHL Union Carbide 9.5-11.1 7.8-13.2 0 Vinylite XYSG Union Carbide 9.5-11.1 7.8-13.2 0 poly(ethylene-co-vinyl acetate) Elvax 150 Du Pont 7.8-10.6 0 0 Elvax 250 Du Pont 8.5-9.5 0 0 Elvax EOD 3602-1 Du Pont 7.8-10.6 7.8-8.5 0 Miscellaneous synthetic oil Reichhold 7.0-11.1 7.4-9.9 9.5-11.4 Beckolin 27 (modified oil) poly(oxyethylene)glycol Union Carbide 8.9-12.7 8.5-14.7 9.5-14.5 Carbowax 4000 chlorinated rubber 8.5-10.6 7.8-10.8 0 hydrocarbon mixture Conoco 7.0-11.1 7.4-9.9 9.5-11.4 Conoco H-35 dammar gum (dewaxed) 8.5-10.6 7.8-9.9 9.5-10.9 chlorosulfonated polyethylene Hypalon 20 Du Pont 8.1-9.8 8.4-8.8 0 Hypalon 30 Du Pont 8.5-10.6 7.8-8.5 0 polygene-bisphenol A condensate General Electric 9.5-10.6 9.3-9.9 0 polycarbonate Lexan 100, 105 arylsulfonamide-formaldehyde condensate Monsanto 10.6-12.7 7.8-14.7 9.5 Santolite MHP shellac (pale-pale) 0 9.9-10.8 9.5-14.5 silicone polymers Silicone DC-23 Dow-Corning 7.4-8.5 7.4-7.8 9.5-10.0 Silicone DC-1107 Dow-Corning 7.0-9.5 9.9-10.8 9.5-11.4 methoxylated partial hydrolyzate of Dow-Corning 7.0-12.7 7.9-12.9 9.5-14.5 phenyl- and phenylmethylsilanes Sylkyd 50 monophenyl polysilaxanol Dow-Corning 8.5-11.1 7.9-12.2 10.0-11.4 Silicone Intermediate Z6018 soy oil 7.0-11.1 7.4-10.8 9.5-11.9 soy oil, blown 7.0-11.1 7.4-10.8 9.5-12.7 p-toluenesulfonamide-formaldehyde 11.8 9.9-14.7 12.7-14.5 __________________________________________________________________________
In practice, an appropriate solvent for the performance of the present invention may readily he selected by first bulk polymerising the monomer mixture to a solid mass and then determining the swellability of portions of that mass in a number of solvents. Those solvents which swell it in excess of 100 pph of polymer will he suitable for the performance of the present invention, provided that they do not contain reactive groups which will interfere with the polymerisation. To obtain high molecular weight cross-linked particles which are capable of forming sols in the solvent, it is desirable to maintain a thermodynamically good solvent at all stages of the reaction.
Specific solvents whose use in the polymerisation of cyclic (thio)ethers and (meth)acrylate esters has been found desirable comprise one or more C1 to C4 alkyl acetates, especially methyl acetate and/or ethyl acetate. In the case of the polymerisation of epoxides or episulphides one or more halogenated hydrocarbons such as methylene chloride and/or chloroform were found very suitable. In the case of the polymerisation of polyisocyanates a mixture of one or more sulphoxides with one or more ketones, or chloroform, were found very suitable.
It is an important advantage of this invention that the polymerisation system does not require the presence, as is generally the case with non-aqueous dispersion or aqueous emulsion polymerisations, of an added stabiliser.
The polymerisation in accordance with this invention may be monitored, particularly at laboratory or pilot plant scale, by observing whether an aliquot of the reactant mixture spread onto a glass slide will form a coherent film. Provided that the solvent has been selected in the manner hereinhefore defined, the formation of coherent films occurs well before gelation.
When a coherent film is formed, or when other monitoring suggests, the polymerisation is terminated before gelation. For polymerisations which occur at elevated temperatures this may be achieved by cooling. Alternatively, polymerisation quenching agents may be added: base for cationic addition polymerisation; weak acids for anionic addition polymerisation; and free radical traps such as alkylated phenolic or quinonoid inhibitors for free radical polymerisation.
According to a further aspect, this invention provides a polymeric material having a weight average molecular weight from 5,000 to 20,000,000 and comprising cross-linked particles which are capable of forming a sol whenever prepared by the process herein described. More particularly, this invention provides a polymeric material having a weight average molecular weight from 5,000 to 20,000,000 comprising particles of a homo- or copolymer of a substituted or unsubstituted (meth)acrylate ester cross-linked by a bis- or tris- vinyl or vinylidene group-containing ester which are capable of forming a sol in a solvent which (a) has a solubility parameter from 2.5 cal1/2 ml-3/2 below to 1.0 cal1/2 ml-3/2 above the solubility parameter of the bulk polymeric material and (b) is of the same or adjacent hydrogen bonding group as the bulk polymeric material, especially wherein the cross-linking ester comprises the bis-methacrylate ester of polyethylene glycol, the bis-methacrylate ester of ethylene glycol or triallyl cyanurate. This invention also provides a polymeric material having a weight average molecular weight from 5,000 to 20,000,000 comprising cross-linked particles of a homo- or copolymer of a polymerisable cyclic (thio)ether which are capable of forming a sol in a solvent which (a) has a solubility parameter from 2.5 cal1/2 ml-3/2 below to 1.0 cal1/2 ml-3/2 above the solubility parameter of the bulk polymeric material and (b) is of the same or adjacent hydrogen bonding group as the bulk polymeric material, especially wherein the cyclic (thio)ether comprises acrolein tetramer. This invention further provides a polymeric material having a weight average molecular weight from 5,000 to 20,000,000 comprising cross-linked particles of a homo-or copolymer of an epoxide or episulphide which are capable of forming a sol in a solvent which (a) has a solubility parameter from 2.5 cal1/2 ml-3/2 below to 1.0 cal1/2 ml-3/2 above the solubility parameter of the bulk polymeric material and (b) is of the same or adjacent hydrogen bonding group as the bulk polymeric material. This invention also provides polymeric material having a weight average molecular weight from 5,000 to 20,000,000 comprising cross-linked particles of a homo- or copolymer of a polyisocyanate which are capable of forming a sol in a solvent which (a) has a solubility parameter from 2.5 cal1/2 ml-3/2 below to 1.0 cal1/2 ml-3/2 above the solubility parameter of the hulk polymeric material and (b) is of the same or adjacent hydrogen bonding group as the hulk polymeric material.
By selecting the solvent in accordance with this invention gelation, which in prior art processes rapidly follows the formation of the aforesaid cross-linked, sol-forming particles, is delayed for a sufficient period to enable the termination to he effected in a controlled manner. The sol-forming particles so produced have a very small particle size in the colloidal or sub-colloidal size range; that is an average primary particle size no greater than 0.2μ.
The reacted solutions so formed can either be used as such, in concentrated form, or the polymer can he recovered. Recovery can he effected by solvent evaporation or mixing, either by addition or reverse addition, with an excess of a non-solvent. A particularly desirable feature of the invention is that the polymer produced by addition of excess non-solvent is typically a flowable powder, generally of fine particle size. Moreover, the polymer powder can readily he redissolved in the same or other solvent selected in accordance with this invention. It is believed that the polymer particles are globular when in solution and it is found that they typically contribute little to the viscosity of the solution until their swollen phase volume exceeds a critical fraction of the whole which, in practice, means that the polymer solution can he concentrated to about 20%, and sometimes to about 30%, by weight and still he readily pourable.
The polymer powders of this invention are useful as industrial and pharmaceutical compression moulding materials. They may be used in admixture with an active substance; for example, a pharmaceutical, bacteriostat, viruscide, insecticide, herbicide, larvicide, fungicide, algaecide, nematocide, topical or dermatological agent, antifoulant for marine growth prevention, enzyme, preservative, fluorescent or other pigment. The polymer powders of this invention are particularly useful as pharmaceutical tableting excipients, especially as direct compression tableting excipients. This is particularly the case for polymers prepared from cyclic (thio)ethers, such as acrolein tetramer. The active substance may be incorporated by admixing solid active substance, for example pharmaceutical or pigment, for example before tableting or the active substance may be added to a solution of the polymer, coprecipitated therewith and then tableted. In the latter case the swollen sol particles permit the active substance to penetrate the polymer network. The polymer powders are also useful as additives for hulk rubbers, sound damping formulations, viscosity control additives.
This invention also provides a polymeric material as herein defined which is dissolved in a solvent which is different from the reaction solvent. This solvent may comprise one or more monomers which may he reactive with the polymeric material. Desirably, at least one of the monomers is a (meth)acrylate ester styrene, alkyl styrene, vinyl chloride or acrylonitrile.
This invention also provides a surface coating composition such as an adhesive paint, varnish or lacquer, especially alkyl and acrylic based surface coatings, which comprise a polymeric material, which may comprise pigment introduced as aforesaid, especially one in a solvent which is different from the reaction solvent as aforesaid. This invention further provides a cured such surface coating composition; such materials typically have a reduced drying time, generate less heat and reduce shrinkage. It is to be noted that even if the solvent monomers do not interpolymerise with the polymeric material of this invention they will penetrate the polymer network and their resultant homopolymers will hind the polymer particles by entanglement.
1.924 lg (0.0086 mols) of acrolein tetramer were added to 0.5379 g (0.0057 mols) of glycerol containing 2% by weight of FeCl3 in a reaction vessel equipped with a nitrogen bleed and a drying tube to exclude moisture. 3.30 cm3 of methyl acetate were added to form a mixture which, initially, was not homogeneous. The mixture was continuously stirred and heated on a water bath whereupon it became homogeneous after about 15 minutes and was permitted to reflux.
Aliquots of the reactant mixture spread onto a slide began to produce solid film after 70 minutes from the beginning of reflux. The solution was then neutralised with triethylamine after 73 minutes of reaction, 1.3×10-4 mols of triethylamine being required for the neutralisation.
The concentration of polymer in the solution was 8.2% by weight. It was possible to concentrate the polymer solution after neutralisation to about 24% by weight by distilling the excess methyl acetate or by using a rotary evaporator.
Polymer powder was obtained from the solution either by a film spreading technique or by precipitating the polymer solution by gradual addition to an excess of hexane.
1.9876 g (0.0089 mol) of acrolein tetramer were added to 1.0703 g (0.012 mol) of glycerol containing 2% by weight of FeCl3, in a reaction vessel equipped as in Example 1. 4 cm3 of methyl acetate were added to form a mixture which became homogeneous after about 15 minutes of stirring and heating. The mixture was refluxed for one hour then a further amount (1.91889 g; 0.0086 mols) of acrolein tetramer was added, along with 56 mol of methylene chloride so that the ratio methyl acetate:methylene chloride was approximately 7:93 by volume and the ratio acrolein tetramer glycerol was 3:2. The refluxing was continued and after 90 minutes from commencing refluxing a film began to form when the solution was spread on a glass slide. The mixture was neutralised after 100 minutes by adding triethylamine.
The concentration of polymer in the solution was 8.3% by weight. The polymer solution could he concentrated to about 24% by weight either by distillation or using a rotary evaporator.
Polymer powder was obtained as described in Example 1.
Using essentially the same preparative technique, copolymers with acrolein tetramer:glycerol weight ratios 70:30, 72:28, 74:26 and 76:24 were also prepared. These copolymers usually had lower molecular weights than the 3:2 copolymer produced in this and Example 1 above.
The preparation was carried out in two stages:
(a) Master hatch preparation
A master hatch of citric acid and acrolein tetramer in ethyl acetate was prepared for use in the preparation of citric acid acrolein tetramer copolymer. The ratio acrolein tetramer:citric acid in the master batch was stoichiometric (2 mols of acrolein tetramer to 1 mol of citric acid on the assumption that the three carboxylic groups and one hydroxyl group in citric acid would react). 35.0965 g (0.1567 mols) of acrolein tetramer were added to 15.0506 g citric acid (0.0783 mols), and the mixture was then added to 450 cm3 of ethyl acetate.
The mixture was next placed in a round-bottom flask and refluxed with continuous stirring under a nitrogen bleed. The refluxing and stirring was stopped after half an hour to provide a homogeneous prepolymer which formed only a low molecular weight tacky film. The notional concentration of acrolein tetramer and citric acid was 10% w/v.
(b) Preparation of the copolymer
200 cm3 of methylene chloride were added to 100 cm3 of the master hatch together with 10 cm3 of 0.3%, FeCl3 solution in methylene chloride. The contents were then stirred at room temperature. After 30 minutes the mixture became cloudy and a solid film-producing solution was formed. The reaction was then terminated by adding triethylamine after one hour of stirring in both stages (a) and (b) combined. Soon after the addition of triethylamine the mixture became very cloudy.
The polymer concentration was 3.5% w/v and could be concentrated to about 10% w/v using a rotary evaporator.
Polymer powder was obtained by precipitation by gradually adding the solution to an excess of hexane.
Copolymers of acrolein tetramer/citric acid/glycerol of different ratios were prepared.
(a) The following procedure was used for the preparation of copolymers with weight ratios of 78:11:11, 78:9:13, 78:7:15 and 78:2:20 of acrolein tetramer/citric acid/glycerol. A similar procedure could be used for other ratios.
1.17 g of acrolein tetramer were added to 0.5 g of anhydrous citric acid and 0.5 g glycerol containing 2% by weight of FeCl3 in a reaction vessel equipped with a nitrogen bleed and a drying tube to exclude moisture. 20 cm3 of ethyl acetate were added to form a mixture which, initially, was not homogeneous. The mixture was continuously stirred and heated on a water bath whereupon it became homogeneous after about half an hour and was permitted to reflux. After one hour of refluxing a further 2.38 g of acrolein tetramer were added together with 30 cm3 methylene chloride. The ratio of acrolein tetramer to the other components was thus 78%. After 30 minutes refluxing after the second addition, the solution was film-forming. The solution was then neutralised by adding a few drops of triethylamine. The concentration of the polymer in the solution was 9% w/v. Polymer powder was obtained by precipitation by adding excess hexane.
(b) Copolymers of acrolein tetramer/citric acid/glycerol with ratios of 78:13:9, 78:15:7 and 78:20:2 were prepared by using the following procedure.
1.00 g of acrolein tetramer was added to 0.41 glycerol containing 2% by weight FeCl3 and 0.59 g of anhydrous citric acid in a reaction vessel equipped with a nitrogen bleed and a drying tube to exclude moisture. 50 cm3 ethyl acetate were added to form a mixture which, initially, was not homogeneous. The mixture was continuously stirred and heated on a water bath whereupon it became homogeneous after about 10 minutes and was permitted to reflux. After 25 minutes of refluxing a further 2.55 g of acrolein tetramer were added, along with 25 cm3 methylene chloride and 0.4 cm3 0.3% ferric chloride solution in methylene chloride. The ratio of acrolein tetramer to the other components was thus 78% of the total content of acrolein tetramer/citric acid/glycerol. After 10 minutes refluxing after the second addition the mixture was film-forming. The solution was then neutralised with triethylamine.
Polymer powder was obtained by precipitation by adding excess hexane. By using the above procedure, copolymers of acrolein tetramer/citric acid/glycerol with a higher content of citric acid than glycerol were prepared, provided that the necessary additional amount of ferric chloride was added in the second stage.
2.2 g of acrolein tetramer (0.01 mol) and 10.0 cm3 of a 0.1% FeCl3 solution in methyl acetate were mixed in a reaction vessel. The concentration of acrolein tetramer in the solution was 22 wt. %. The mixture was then allowed to react at a temperature of 20° C. and after 65 minutes a turbid solution was formed. After 70 minutes 1.14 cm3 (0.02 mol) of ethanol as added to terminate the polymerisation.
After the addition of the alcohol, the mixture was refluxed for a further 15 minutes to produce a slightly turbid low viscosity solution. The solution, spread on a glass microscope slide, produced a continuous solid dry polymeric film.
Polymer powder was obtained by adding excess alcohol or hexane to the solution.
The materials used in these three Examples were:
(a) a cycloaliphatic epoxy resin (Trade Mark CY179, 3M Company);
(b) epoxy curing agent FC503 (Trade Mark, 3M Company);
(c) the polymer, in solution in methyl acetate, produced according to Example 5.
The three components were admixed, in the proportions by weight given in the Table below, and the methyl acetate was evaporated off in the dark in an oven with forced ventilation. The resulting materials were golden yellow in colour.
TABLE 3 ______________________________________ Example No. 6 7 8 ______________________________________ FC503 10 10 10 Microparticulate polymer 20 30 40 CY179 70 60 50 100 100 100 ______________________________________
The products were coated as thin films on an aluminium sheet and were found to cure rapidly to a tack-free, scratch-resistant film after one passage under a U.V. lamp in a line travelling at 300 feet per minute.
Diglycidylether of hisphenol known as Epikote (Trade Mark) 828 was used to prepare a crosslinked sol in methylene chloride solution.
5 cm3 of BF3 solution was added to a mixture of 100 cm3 30% Epikote 828 solution and 750 cm3 of methylene chloride. Polymerisation was effected at room temperature under a nitrogen atmosphere for 3 hours, during which time the solution became more viscous.
The mixture was film-forming after 20 minutes and was neutralised, with triethylamine, after 3 hours of polymerisation.
Various polymers based on Epikote 828 were prepared using the above procedure but altering the polymerisation time from 1 hour to 5 hours. The BF3 solution was prepared by diluting BF3 methanol solution to a 45% solution with methylene chloride. The Epikote 828 solution was prepared in methylene chloride.
At the end of the polymerisation, the polymer concentration was 6.5% w/v. However, it was possible to concentrate the solution by using a rotary evaporator while avoiding heating. It was possible to achieve 16% polymer solution without affecting its stability. Polymer powder was obtained by precipitation by adding excess hexane, slowly with continuous stirring. The polymer powder could he readily dispersed again in methylene chloride.
Polyethylene glycol 6000 (ex ICI) and trimethylol propane were dried under vacuum for 1 hour at 70° C. Diphenylmethane-4, 4'-diisocyanate (MDI) was distilled under reduced pressure and used immediately.
Polyethylene glycol 6000 (10 g) was placed in a 250 cm3 glass flask equipped with stirrer, nitrogen bleed, condenser and CaCl2 drying tube to exclude moisture with a mixture of dimethylsulphoxide and methyl ethyl ketone in a weight ratio of 1:1 (50 g) and heated to 70° C. MDI (1.15 g) was then added followed, after 5 minutes, by trimethylol propane (0.27 g). The mixture was next heated at 80°-100° C. for 5 hours by which time no infra-red isocyanate absorption hand at 2275 nm could he detected and polymer solution had formed.
Polymer powder was obtained by slowly adding the polymer solution to an excess of cyclohexane or petrol ether (60/80) followed by filtration and drying in a vacuum oven at room temperature.
The powder so formed would readily redisperse to a stable system in either 1:1 dimethylsulphoxide/methyl isobutyl ketone or into water.
The dispersion in water had the interesting characteristic of being clear at room temperature hut of milky appearance at 100 ° C. The dispersion is useful as a thickener in water as it can provide very viscous dispersions at room temperature which show a remarkable reduction in viscosity at elevated temperature.
3.89 g of triallyl cyanurate was added to 105 cm3 of methyl methacrylate in a round bottom flask heated in a heating mantle. These were stirred together with 5.00 cm3 ethyl acetate under a nitrogen atmosphere for 20 minutes followed by the addition of 5ml of 7% benzoyl peroxide solution. Refluxing and stirring was continued under a nitrogen atmosphere for 5 hours. After 5 hours polymerisation the mixture was cooled to room temperature. Polymer powder was obtained by precipitation by adding the polymer solution gradually to excess methanol.
Claims (2)
1. A solution polymerization process for forming a sol of cross-linked particles having an average particle size of no greater than 0.2 microns and a weight average molecular weight of from 5,000-20,000,000, which process comprises:
i) polymerizing one or more monomers, said monomer or at least one of which monomers is a cross-linking agent present in an amount sufficient such that a sol of cross-linked particles is obtained, in a solvent which (a) has a solubility parameter from 2.5 cal1/2 ml-3/2 below to 1.0 cal1/2 ml-3/2 above the solubility parameter of the bulk polymeric material and (b) is of the same or adjacent hydrogen bonding group as the bulk polymeric material;
ii) monitoring the polymerization until said sol is obtained; and
iii) terminating the polymerization prior to gelation.
2. A composition of matter comprising a sol of cross-linked polymer of one or more monomers, at least one of said monomers being a cross-linking agent, and a solvent having a solubility parameter of from 2.5 cal1/2 ml-3/2 below to 1.0 cal1/2 ml-3/2 above the polymers bulk solubility parameter and is of the same or adjacent hydrogen bonding group as said bulk polymer, prepared by polymerizing said monomer(s) in an amount of said solvent sufficient that no gel is formed upon polymerizing said monomer(s) to the point at which said polymerizing mixture forms a coherent film when spread on a glass slide, wherein said at least one monomer is selected from the group consisting of a C1-8 alkyl methacrylate, a bis-methacrylate ester of polyethylene glycol, a bis-methacrylate ester of ethylene glycol and triallyl cyanurate.
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US33552681A | 1981-12-29 | 1981-12-29 | |
US55202083A | 1983-11-17 | 1983-11-17 | |
US65599084A | 1984-09-28 | 1984-09-28 | |
US76770585A | 1985-08-22 | 1985-08-22 | |
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US5918187A | 1987-06-12 | 1987-06-12 | |
US42535689A | 1989-10-20 | 1989-10-20 | |
US19545294A | 1994-02-14 | 1994-02-14 | |
US08/487,394 US5863996A (en) | 1980-12-30 | 1995-06-07 | Solution polymerization to form sol of crosslinked particles |
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US20140370114A1 (en) * | 2013-06-13 | 2014-12-18 | Gwangju Institute Of Science And Technology | Homopolymer nanoparticles by self-emulsion polymerization reaction and preparation method thereof |
WO2014204125A1 (en) | 2013-06-17 | 2014-12-24 | (주)라미나 | Particle production device and particle production method using same |
WO2014202089A2 (en) | 2013-06-18 | 2014-12-24 | Roskilde Universitet | Variants of anti-freeze polypeptides |
KR20190062709A (en) | 2017-11-29 | 2019-06-07 | 주식회사 울트라브이 | The fabrication method of fine particle of biodegradable polymer, the fabrication method of injection including the same, and reactor for manufacturing fine particle of biodegradable polymer |
KR102051044B1 (en) | 2019-05-27 | 2019-12-02 | 주식회사 울트라브이 | The fabrication method of filler of biodegradable polymer, ans the fabrication method of injection including the same |
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US20060094830A1 (en) * | 2004-11-04 | 2006-05-04 | Wayne Devonport | High solids preparation of crosslinked polymer particles |
WO2006048539A1 (en) | 2004-11-04 | 2006-05-11 | Coatex S.A.S. | Substituted cumyl phenols, use thereof in a copolymerisation method copolymers thus obtained and use thereof as thickeners |
US7504466B2 (en) * | 2004-11-04 | 2009-03-17 | Rohm And Haas Company | High solids preparation of crosslinked polymer particles |
EP2602263A2 (en) | 2007-11-21 | 2013-06-12 | Roskilde Universitet | Polypeptides comprising an ice-binding activity |
WO2010059000A2 (en) | 2008-11-21 | 2010-05-27 | (주)Lg화학 | Method and apparatus for manufacturing polymer particle |
US20140370114A1 (en) * | 2013-06-13 | 2014-12-18 | Gwangju Institute Of Science And Technology | Homopolymer nanoparticles by self-emulsion polymerization reaction and preparation method thereof |
US10093752B2 (en) * | 2013-06-13 | 2018-10-09 | Gwangju Institute Of Science And Technology | Homopolymer nanoparticles by self-emulsion polymerization reaction and preparation method thereof |
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US10005062B2 (en) | 2013-06-17 | 2018-06-26 | Laminar Co., Ltd | Apparatus for manufacturing particles and method for manufacturing particles using the same |
WO2014202089A2 (en) | 2013-06-18 | 2014-12-24 | Roskilde Universitet | Variants of anti-freeze polypeptides |
KR20190062709A (en) | 2017-11-29 | 2019-06-07 | 주식회사 울트라브이 | The fabrication method of fine particle of biodegradable polymer, the fabrication method of injection including the same, and reactor for manufacturing fine particle of biodegradable polymer |
KR102051044B1 (en) | 2019-05-27 | 2019-12-02 | 주식회사 울트라브이 | The fabrication method of filler of biodegradable polymer, ans the fabrication method of injection including the same |
Also Published As
Publication number | Publication date |
---|---|
HK79985A (en) | 1985-10-25 |
JPS57145101A (en) | 1982-09-08 |
DE3151923A1 (en) | 1982-07-08 |
DE3151923C2 (en) | 1991-05-08 |
JPH055077A (en) | 1993-01-14 |
JPH0613675B2 (en) | 1994-02-23 |
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